data = {
    Accept: application / json,
    text / javascript,
    *
    /*; q=0.01
    Accept-Encoding:gzip, deflate, br
    Accept-Language:zh-CN,zh;q=0.9
    Connection:keep-alive
    Content-Length:80
    Content-Type:application/x-www-form-urlencoded; charset=UTF-8
    Cookie:mc_channel=bdqdrmjt; mc_marking=4ee47ddf7462b1f5bfbb41dc44070bce; UM_distinctid=161382bdf0d3bc-06289a6a4b8a1b-5a442916-1fa400-161382bdf0ec44; CNZZDATA1261110065=1075862102-1517063387-https%253A%252F%252Fwww.baidu.com%252F%7C1517063387; imooc_uuid=d392a173-472f-4e62-900c-c2a506aa6555; imooc_isnew=1; imooc_isnew_ct=1517065856; IMCDNS=0; loginstate=1; last_login_username=81855417%40qq.com; apsid=BlMDdlMmMxYzMyYzVlYmYwYTM0M2IzNmU2MjllNWQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMjE4Mzk5OQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA4MTg1NTQxN0BxcS5jb20AAAAAAAAAAAAAAAAAAAAAAGU1MmIzZTdmMzczOTA1NzVjNzhmYzRkN2FlMjk2YWNh%2BJdsWviXbFo%3DOT; PHPSESSID=0knsje8bsv7dv1aehmrdvi6eq0; Hm_lvt_f0cfcccd7b1393990c78efdeebff3968=1517065855,1517113675,1517114137; Hm_lpvt_f0cfcccd7b1393990c78efdeebff3968=1517114145; cvde=5a6d514abac48-31
    Host:www.imooc.com
    Origin:https://www.imooc.com
    Referer:https://www.imooc.com/video/8837
    User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36
    X-Requested-With:XMLHttpRequest}